Ploumpidou, Evi, Romme, Sjoerd, Gibescu, Madeleine, Bronswijk, Arno, Stokman, Harry, van Willigenburg, Pepijn, AND Paulus, Wil. " Transition towards DC micro grids: From an AC to a hybrid AC and DC energy infrastructure" SPOOL [Online], Volume 4 Number 2 (26 December 2017)